Today for tomorrow.

Today for tomorrow.


Higher safety for universal applications.

KLINGERSIL® C-4400 is a universal material for safe and reliable sealing. It consists of a unique matrix, which offers an excellent combination of different properties.


Aramid fibers, bonded with NBR.

Areas of application

Resistant to oils, water, steam, gases, salt solutions, fuels, alcohols, moderate organic and inorganic acids, hydrocarbons, lubricants and refrigerants.
  • Used for oil, steam, hydrocarbons, oxygen and water.
  • Premium quality material for many industrial sealing applications.
  • Excellent resistance to hot water and steam.


  • Good resistance to oils, fuels, hydrocarbons.
  • Very successful in internal combustion engine applications.
  • Available in sheet form and as cut gaskets.
  • 3xA anti-stick finish on both sides.
  • Universal high pressure gasket material.
  • Dimensionally stable.
  • Consistent material composition.
  • Excellent price/Performance ratio.
  • Suitable for many different media.
  • Also available with reinforcements: KLINGERSIL® C-4408, stainless steel mesh.

Typical specifications

Based on 2.0mm thick sample

Colour Green
Compressibility (ASTM F36J) %11
Recovery (ASTM F36J) %55
Stress relaxation DIN 5291350MPa, 16h/175ºCN/mm²32
Stress relaxation DIN 52913 50MPa, 16h/300ºCN/mm²25
Stress relaxation BS 753140MPa, 16h/300ºCN/mm²23
KLINGER hot/cold compression Decrease in thickness at 23ºC
Decrease in thickness at 300ºC
Gas leakage (DIN 3535/6) ml/min <0.2
Thickness increase after immersion in
Oil IRM 903, 5h/150ºC
Fuel B, 5h/23ºC
Thermal conductivity W/mK0.4 - 0.42
Density g/cm³1.6

Tests and Certifications

  • BS 7531 Grade Y
  • BS F 130 Type A
  • Fire-safe according to ISO 10497
  • HTB
  • BAM U W28 for use with oxygen 130bar/ 80ºC
  • KTW
  • Germanischer Lloyd
  • TA-Luft (Clean Air) certificate acc. VDI 2440

Dimensions of the standard sheets

Sheeting (m) 2.0 x 1.5*, 6.0 x 2.0, 6.0 x 1.5
(*Denotes standard sheet size)
Thickness (mm) 0.6, 0.8, 1.0, 1.5, 2.0, 3.0
TolerancesThickness acc. to DIN 28091-1
Length ±50 mm, Width ±50 mm

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